Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:32:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<Hash[_class].size(); i++) ^ user.cpp:36:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[x].sons.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:44:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbore3.in", "r", stdin); ^ user.cpp:45:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbore3.out", "w", stdout); ^ user.cpp:47:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &S); ^ user.cpp:51:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^